نتایج جستجو برای: مدل weather generator

تعداد نتایج: 204960  

ژورنال: :نیوار 0
ایمان بابائیان پژوهشکده اقلیم شناسی،گروه پژوهشی اقلیم شناسی کاربردی زهرا نجفی نیک پژوهشکده اقلیم شناسی،گروه پژوهشی اقلیم شناسی کاربردی

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2011
Malika Khalili François Brissette Robert Leconte

A multi-site weather generator has been developed using the concept of spatial autocorrelation. The multi-site generation approach reproduces the spatial autocorrelations observed between a set of weather stations as well as the correlations between each pair of stations. Its performance has been assessed in two previous studies using both precipitation and temperature data. The main objective ...

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده جغرافیا 1392

مدل های گردش عمومی جو به دلیل بزرگ مقیاس بودن شبکه ی محاسباتی آنها قادر به پیش بینی پارامتر های آب و هواشناختی در مقیاس نقطه ای نیستند لذا دانشمندان ابزار واسطی به نام مدل های generator weather ایجاد کدره اند که می توان براساس آن و با استفاده از خروجی مدل های عددی تغییر اقلیم را در مقیاس نقطه ای و ایستگاه هواشناسی مورد مطالعه و ارزیابی قرار داد . لذا آن ها بایستی توسط مدل های دینامیکی منطقه ای ...

Journal: :پژوهش های جغرافیایی (منتشر نمی‏شود) 0
کاظم نصرتی دانشجوی دکترای دانشکده علوم زمین دانشگاه شهید بهشتی غلامرضا زهتابیان استاد دانشکده منابع طبیعی دانشگاه تهران اسحق مرادی استادیار گروه جغرافیای طبیعی دانشکده جغرافیا دانشگاه تهران افسانه شهبازی دانشجوی دکترای دانشکده منابع طبیعی و علوم دریایی دانشگاه تربیت مدرس

abstract long-term historical weather data are needed to conduct crop simulation analysis. simulated climatic data may be used when long series of historic data are not available or convenient or when future data are needed. the aim of this study was to generate daily weather values for maximum and minimum air temperatures. a number of weather generators are compared here. data from ten station...

The aim of this paper is to project extreme precipitation events in an arid and a semiarid station. In order to project climate change based on general circulation models (GCMs), we have applied LARS-WG[1] downscaling tool. This stochastic weather generator down-scaled the climate of two synoptic stations using HADCM3 model and A2 emission scenario for 2040. We extracted extreme precipitation e...

Journal: :Environmental Modelling and Software 2010
Andrew G. Birt M. R. Valdez-Vivas R. M. Feldman Charles W. Lafon David M. Cairns Robert N. Coulson Maria D. Tchakerian Weimin Xi James M. Guldin

Stochastic weather generators are useful tools for exploring the relationship between organisms and their environment. This paper describes a simple weather generator that can be used in ecological modeling projects. We provide a detailed description of methodology, and links to full Cþþ source code (http://weathergen.sourceforge.net) required to implement or modify the generator. We argue that...

1998
Tianfang Yao Dongmo Zhang Qian Wang

The MLWFA (Multilingual Weather Forecasts Assistant) system will be demonstrated. It is developed to generate the multilingual text of the weather forecasts automatically. The raw data from the weather observation can be used to generate the weather element chart. According to the weather change trend, the forecasters can directly modify the value Of the element on the chart, such as the center...

Journal: :Computer and Information Science 2010
Behnam Ababaei Teymour Sohrabi Farhad Mirzaei Bakhtiar Karimi

Stochastic weather generators are used in different studies which often require long series of daily weather data for risk assessment. They can produce synthetic daily time series of any length. Any generator should be tested to ensure that the synthetic data is proper for the purposes for which it is to be used. The main objective of this paper is to test a stochastic weather generator, LARS-W...

1998
Tianfang Yao Dongmo Zhang Qian Wang

The MLWFA (Multilingual Weather Forecasts Assistant) system will be demonstrated. It is developed to generate the multilingual text of the weather forecasts automatically. The raw data from the weather observation can be used to generate the weather element chart. According to the weather change trend, the forecasters can directly modify the value Of the element on the chart, such as the center...

2005
James W. Hansen Amor V.M. Ines

Stochastic weather generators are useful for producing daily sequences that reproduce climatic statistics aggregated to, e.g., a monthly time scale, for use with biological simulation models. This paper describes a stochastic weather generator that disaggregates monthly rainfall by adjusting input parameters or by constraining output to match target rainfall totals, and demonstrates its use wit...

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